| Project/Area Number |
23540399
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Sophia University (2013)
Tohoku University (2011-2012) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KOIKE Yoji 東北大学, 大学院・工学研究科, 教授 (70134038)
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| Co-Investigator(Renkei-kenkyūsha) |
WATANABE Isao 理化学研究所, 仁科加速器研究センター, 専任研究員 (40260195)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 強相関電子系 / 超電導材料・素子 / 低温物性 / 放射線・Ｘ線・粒子線 / 磁性 / 放射線・X線・粒子線 / 超伝導材料・素子 |
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| Research Abstract |
In order to investigate the relationship between the spin correlation and superconductivity, we have performed muon-spin-relaxation measurements using high-quality single crystals of the impurity-substituted iron-based superconductor Fe1-y(Co,Ni,Zn)ySe0.3Te0.7 and of the electron-doped high-Tc cuprate Pr1.3-xLa0.7CexCuO4+d. Impurity-induced development of the spin correlation has been found in Fe1-y(Co,Ni,Zn)ySe0.3Te0.7, suggesting the orbital fluctuations as a glue of electron pairs. In Pr1.3-xLa0.7CexCuO4+d, it has been found that the superconductivity coexists with a short-range magnetic order at low temperatures. This novel coexistence can be understood in terms of the band picture including the strong electron correlation. Accordingly, it has been concluded that in cuprates, the spin correlation plays an important role on the appearance of superconductivity and that in iron-based superconductors, the appearance of the superconductivity is not so affected by the spin correlation.
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